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##############################################################################
# Copyright (c) 2016 Huawei Technologies Co.,Ltd and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################
from __future__ import absolute_import

import errno
import logging
import os
import subprocess
import threading
import time
import uuid
import glob
import yaml
import collections

from six.moves import configparser
from oslo_serialization import jsonutils
from docker import Client

from api.database.v1.handlers import AsyncTaskHandler
from api.utils import influx
from api.utils.common import result_handler
from yardstick.common import constants as consts
from yardstick.common import utils as common_utils
from yardstick.common import openstack_utils
from yardstick.common.httpClient import HttpClient


logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)


def createGrafanaContainer(args):
    task_id = str(uuid.uuid4())

    thread = threading.Thread(target=_create_grafana, args=(task_id,))
    thread.start()

    return result_handler('success', {'task_id': task_id})


def _create_grafana(task_id):
    _create_task(task_id)

    client = Client(base_url=consts.DOCKER_URL)

    try:
        image = '{}:{}'.format(consts.GRAFANA_IMAGE, consts.GRAFANA_TAG)
        if not _check_image_exist(client, image):
            client.pull(consts.GRAFANA_IMAGE, consts.GRAFANA_TAG)

        _create_grafana_container(client)

        time.sleep(5)

        _create_data_source()

        _create_dashboard()

        _update_task_status(task_id)
    except Exception as e:
        _update_task_error(task_id, str(e))
        logger.exception('Error: %s', e)


def _create_dashboard():
    url = 'http://admin:admin@%s:3000/api/dashboards/db' % consts.GRAFANA_IP
    path = os.path.join(consts.REPOS_DIR, 'dashboard', '*dashboard.json')

    for i in sorted(glob.iglob(path)):
        with open(i) as f:
            data = jsonutils.load(f)
        HttpClient().post(url, data)


def _create_data_source():
    url = 'http://admin:admin@%s:3000/api/datasources' % consts.GRAFANA_IP
    data = {
        "name": "yardstick",
        "type": "influxdb",
        "access": "proxy",
        "url": "http://%s:8086" % consts.INFLUXDB_IP,
        "password": "root",
        "user": "root",
        "database": "yardstick",
        "basicAuth": True,
        "basicAuthUser": "admin",
        "basicAuthPassword": "admin",
        "isDefault": False,
    }
    HttpClient().post(url, data)


def _create_grafana_container(client):
    ports = [3000]
    port_bindings = {k: k for k in ports}
    restart_policy = {"MaximumRetryCount": 0, "Name": "always"}
    host_config = client.create_host_config(port_bindings=port_bindings,
                                            restart_policy=restart_policy)

    container = client.create_container(image='%s:%s' % (consts.GRAFANA_IMAGE,
                                                         consts.GRAFANA_TAG),
                                        ports=ports,
                                        detach=True,
                                        tty=True,
                                        host_config=host_config)
    client.start(container)


def _check_image_exist(client, t):
    return any(t in a['RepoTags'][0] for a in client.images() if a['RepoTags'])


def createInfluxDBContainer(args):
    task_id = str(uuid.uuid4())

    thread = threading.Thread(target=_create_influxdb, args=(task_id,))
    thread.start()

    return result_handler('success', {'task_id': task_id})


def _create_influxdb(task_id):
    _create_task(task_id)

    client = Client(base_url=consts.DOCKER_URL)

    try:
        _change_output_to_influxdb()

        if not _check_image_exist(client, '%s:%s' % (consts.INFLUXDB_IMAGE,
                                                     consts.INFLUXDB_TAG)):
            client.pull(consts.INFLUXDB_IMAGE, tag=consts.INFLUXDB_TAG)

        _create_influxdb_container(client)

        time.sleep(5)

        _config_influxdb()

        _update_task_status(task_id)
    except Exception as e:
        _update_task_error(task_id, str(e))
        logger.debug('Error: %s', e)


def _create_influxdb_container(client):

    ports = [8083, 8086]
    port_bindings = {k: k for k in ports}
    restart_policy = {"MaximumRetryCount": 0, "Name": "always"}
    host_config = client.create_host_config(port_bindings=port_bindings,
                                            restart_policy=restart_policy)

    container = client.create_container(image='%s:%s' % (consts.INFLUXDB_IMAGE,
                                                         consts.INFLUXDB_TAG),
                                        ports=ports,
                                        detach=True,
                                        tty=True,
                                        host_config=host_config)
    client.start(container)


def _config_influxdb():
    try:
        client = influx.get_data_db_client()
        client.create_user(consts.INFLUXDB_USER,
                           consts.INFLUXDB_PASS,
                           consts.INFLUXDB_DB_NAME)
        client.create_database(consts.INFLUXDB_DB_NAME)
        logger.info('Success to config influxDB')
    except Exception as e:
        logger.debug('Failed to config influxDB: %s', e)


def _change_output_to_influxdb():
    common_utils.makedirs(consts.CONF_DIR)

    parser = configparser.ConfigParser()
    parser.read(consts.CONF_SAMPLE_FILE)

    parser.set('DEFAULT', 'dispatcher', 'influxdb')
    parser.set('dispatcher_influxdb', 'target',
               'http://%s:8086' % consts.INFLUXDB_IP)

    with open(consts.CONF_FILE, 'w') as f:
        parser.write(f)


def prepareYardstickEnv(args):
    task_id = str(uuid.uuid4())

    thread = threading.Thread(target=_prepare_env_daemon, args=(task_id,))
    thread.start()

    return result_handler('success', {'task_id': task_id})


def _already_source_openrc():
    """Check if openrc is sourced already"""
    return all(os.environ.get(k) for k in ['OS_AUTH_URL', 'OS_USERNAME',
                                           'OS_PASSWORD', 'EXTERNAL_NETWORK'])


def _prepare_env_daemon(task_id):
    _create_task(task_id)

    try:
        _create_directories()

        rc_file = consts.OPENRC

        if not _already_source_openrc():
            if not os.path.exists(rc_file):
                installer_ip = os.environ.get('INSTALLER_IP', '192.168.200.2')
                installer_type = os.environ.get('INSTALLER_TYPE', 'compass')
                _get_remote_rc_file(rc_file, installer_ip, installer_type)
                _source_file(rc_file)
                _append_external_network(rc_file)
            _source_file(rc_file)

        _clean_images()

        _load_images()

        _update_task_status(task_id)
    except Exception as e:
        _update_task_error(task_id, str(e))
        logger.debug('Error: %s', e)


def _create_directories():
    common_utils.makedirs(consts.CONF_DIR)


def _source_file(rc_file):
    common_utils.source_env(rc_file)


def _get_remote_rc_file(rc_file, installer_ip, installer_type):

    os_fetch_script = os.path.join(consts.RELENG_DIR, consts.FETCH_SCRIPT)

    try:
        cmd = [os_fetch_script, '-d', rc_file, '-i', installer_type,
               '-a', installer_ip]
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
        p.communicate()

        if p.returncode != 0:
            logger.debug('Failed to fetch credentials from installer')
    except OSError as e:
        if e.errno != errno.EEXIST:
            raise


def _append_external_network(rc_file):
    neutron_client = openstack_utils.get_neutron_client()
    networks = neutron_client.list_networks()['networks']
    try:
        ext_network = next(n['name'] for n in networks if n['router:external'])
    except StopIteration:
        logger.warning("Can't find external network")
    else:
        cmd = 'export EXTERNAL_NETWORK=%s' % ext_network
        try:
            with open(rc_file, 'a') as f:
                f.write(cmd + '\n')
        except OSError as e:
            if e.errno != errno.EEXIST:
                raise


def _clean_images():
    cmd = [consts.CLEAN_IMAGES_SCRIPT]
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, cwd=consts.REPOS_DIR)
    output = p.communicate()[0]
    logger.debug('The result is: %s', output)


def _load_images():
    cmd = [consts.LOAD_IMAGES_SCRIPT]
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, cwd=consts.REPOS_DIR)
    output = p.communicate()[0]
    logger.debug('The result is: %s', output)


def _create_task(task_id):
    async_handler = AsyncTaskHandler()
    task_dict = {
        'task_id': task_id,
        'status': 0
    }
    async_handler.insert(task_dict)


def _update_task_status(task_id):
    async_handler = AsyncTaskHandler()

    task = async_handler.get_task_by_taskid(task_id)
    async_handler.update_status(task, 1)


def _update_task_error(task_id, error):
    async_handler = AsyncTaskHandler()

    task = async_handler.get_task_by_taskid(task_id)
    async_handler.update_status(task, 2)
    async_handler.update_error(task, error)


def update_openrc(args):
    try:
        openrc_vars = args['openrc']
    except KeyError:
        return result_handler(consts.API_ERROR, 'openrc must be provided')
    else:
        if not isinstance(openrc_vars, collections.Mapping):
            return result_handler(consts.API_ERROR, 'args should be a dict')

    lines = ['export {}={}\n'.format(k, v) for k, v in openrc_vars.items()]
    logger.debug('Writing: %s', ''.join(lines))

    logger.info('Writing openrc: Writing')
    common_utils.makedirs(consts.CONF_DIR)

    with open(consts.OPENRC, 'w') as f:
        f.writelines(lines)
    logger.info('Writing openrc: Done')

    logger.info('Source openrc: Sourcing')
    try:
        _source_file(consts.OPENRC)
    except Exception as e:
        logger.exception('Failed to source openrc')
        return result_handler(consts.API_ERROR, str(e))
    logger.info('Source openrc: Done')

    return result_handler(consts.API_SUCCESS, {'openrc': openrc_vars})


def upload_pod_file(args):
    try:
        pod_file = args['file']
    except KeyError:
        return result_handler(consts.API_ERROR, 'file must be provided')

    logger.info('Checking file')
    data = yaml.load(pod_file.read())
    if not isinstance(data, collections.Mapping):
        return result_handler(consts.API_ERROR, 'invalid yaml file')

    logger.info('Writing file')
    with open(consts.POD_FILE, 'w') as f:
        yaml.dump(data, f, default_flow_style=False)
    logger.info('Writing finished')

    return result_handler(consts.API_SUCCESS, {'pod_info': data})